[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mips / kernel / syscall.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/mman.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/unistd.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/elf.h>

#include <asm/asm.h>
#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/asm-offsets.h>
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/shmparam.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>

/*
 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
 * convention.  It returns results in registers $v0 / $v1 which means there
 * is no need for it to do verify the validity of a userspace pointer
 * argument.  Historically that used to be expensive in Linux.  These days
 * the performance advantage is negligible.
 */
asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
{
	int fd[2];
	int error, res;

	error = do_pipe_flags(fd, 0);
	if (error) {
		res = error;
		goto out;
	}
	regs.regs[3] = fd[1];
	res = fd[0];
out:
	return res;
}

unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */

EXPORT_SYMBOL(shm_align_mask);

#define COLOUR_ALIGN(addr,pgoff)				\
	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct * vmm;
	int do_color_align;
	unsigned long task_size;

#ifdef CONFIG_32BIT
	task_size = TASK_SIZE;
#else /* Must be CONFIG_64BIT*/
	task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
#endif

	if (len > task_size)
		return -ENOMEM;

	if (flags & MAP_FIXED) {
		/* Even MAP_FIXED mappings must reside within task_size.  */
		if (task_size - len < addr)
			return -EINVAL;

		/*
		 * We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) &&
		    ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
			return -EINVAL;
		return addr;
	}

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;
	if (addr) {
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);
		vmm = find_vma(current->mm, addr);
		if (task_size - len >= addr &&
		    (!vmm || addr + len <= vmm->vm_start))
			return addr;
	}
	addr = current->mm->mmap_base;
	if (do_color_align)
		addr = COLOUR_ALIGN(addr, pgoff);
	else
		addr = PAGE_ALIGN(addr);

	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
		/* At this point:  (!vmm || addr < vmm->vm_end). */
		if (task_size - len < addr)
			return -ENOMEM;
		if (!vmm || addr + len <= vmm->vm_start)
			return addr;
		addr = vmm->vm_end;
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
	}
}

void arch_pick_mmap_layout(struct mm_struct *mm)
{
	unsigned long random_factor = 0UL;

	if (current->flags & PF_RANDOMIZE) {
		random_factor = get_random_int();
		random_factor = random_factor << PAGE_SHIFT;
		if (TASK_IS_32BIT_ADDR)
			random_factor &= 0xfffffful;
		else
			random_factor &= 0xffffffful;
	}

	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
	mm->get_unmapped_area = arch_get_unmapped_area;
	mm->unmap_area = arch_unmap_area;
}

static inline unsigned long brk_rnd(void)
{
	unsigned long rnd = get_random_int();

	rnd = rnd << PAGE_SHIFT;
	/* 8MB for 32bit, 256MB for 64bit */
	if (TASK_IS_32BIT_ADDR)
		rnd = rnd & 0x7ffffful;
	else
		rnd = rnd & 0xffffffful;

	return rnd;
}

unsigned long arch_randomize_brk(struct mm_struct *mm)
{
	unsigned long base = mm->brk;
	unsigned long ret;

	ret = PAGE_ALIGN(base + brk_rnd());

	if (ret < mm->brk)
		return mm->brk;

	return ret;
}

SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
	unsigned long, prot, unsigned long, flags, unsigned long,
	fd, off_t, offset)
{
	unsigned long result;

	result = -EINVAL;
	if (offset & ~PAGE_MASK)
		goto out;

	result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);

out:
	return result;
}

SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	unsigned long, pgoff)
{
	if (pgoff & (~PAGE_MASK >> 12))
		return -EINVAL;

	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
}

save_static_function(sys_fork);
static int __used noinline
_sys_fork(nabi_no_regargs struct pt_regs regs)
{
	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
}

save_static_function(sys_clone);
static int __used noinline
_sys_clone(nabi_no_regargs struct pt_regs regs)
{
	unsigned long clone_flags;
	unsigned long newsp;
	int __user *parent_tidptr, *child_tidptr;

	clone_flags = regs.regs[4];
	newsp = regs.regs[5];
	if (!newsp)
		newsp = regs.regs[29];
	parent_tidptr = (int __user *) regs.regs[6];
#ifdef CONFIG_32BIT
	/* We need to fetch the fifth argument off the stack.  */
	child_tidptr = NULL;
	if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
		int __user *__user *usp = (int __user *__user *) regs.regs[29];
		if (regs.regs[2] == __NR_syscall) {
			if (get_user (child_tidptr, &usp[5]))
				return -EFAULT;
		}
		else if (get_user (child_tidptr, &usp[4]))
			return -EFAULT;
	}
#else
	child_tidptr = (int __user *) regs.regs[8];
#endif
	return do_fork(clone_flags, newsp, &regs, 0,
	               parent_tidptr, child_tidptr);
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
	int error;
	char * filename;

	filename = getname((const char __user *) (long)regs.regs[4]);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename,
			  (const char __user *const __user *) (long)regs.regs[5],
	                  (const char __user *const __user *) (long)regs.regs[6],
			  &regs);
	putname(filename);

out:
	return error;
}

SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
	struct thread_info *ti = task_thread_info(current);

	ti->tp_value = addr;
	if (cpu_has_userlocal)
		write_c0_userlocal(addr);

	return 0;
}

static inline int mips_atomic_set(struct pt_regs *regs,
	unsigned long addr, unsigned long new)
{
	unsigned long old, tmp;
	unsigned int err;

	if (unlikely(addr & 3))
		return -EINVAL;

	if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
		return -EINVAL;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		__asm__ __volatile__ (
		"	.set	mips3					\n"
		"	li	%[err], 0				\n"
		"1:	ll	%[old], (%[addr])			\n"
		"	move	%[tmp], %[new]				\n"
		"2:	sc	%[tmp], (%[addr])			\n"
		"	beqzl	%[tmp], 1b				\n"
		"3:							\n"
		"	.section .fixup,\"ax\"				\n"
		"4:	li	%[err], %[efault]			\n"
		"	j	3b					\n"
		"	.previous					\n"
		"	.section __ex_table,\"a\"			\n"
		"	"STR(PTR)"	1b, 4b				\n"
		"	"STR(PTR)"	2b, 4b				\n"
		"	.previous					\n"
		"	.set	mips0					\n"
		: [old] "=&r" (old),
		  [err] "=&r" (err),
		  [tmp] "=&r" (tmp)
		: [addr] "r" (addr),
		  [new] "r" (new),
		  [efault] "i" (-EFAULT)
		: "memory");
	} else if (cpu_has_llsc) {
		__asm__ __volatile__ (
		"	.set	mips3					\n"
		"	li	%[err], 0				\n"
		"1:	ll	%[old], (%[addr])			\n"
		"	move	%[tmp], %[new]				\n"
		"2:	sc	%[tmp], (%[addr])			\n"
		"	bnez	%[tmp], 4f				\n"
		"3:							\n"
		"	.subsection 2					\n"
		"4:	b	1b					\n"
		"	.previous					\n"
		"							\n"
		"	.section .fixup,\"ax\"				\n"
		"5:	li	%[err], %[efault]			\n"
		"	j	3b					\n"
		"	.previous					\n"
		"	.section __ex_table,\"a\"			\n"
		"	"STR(PTR)"	1b, 5b				\n"
		"	"STR(PTR)"	2b, 5b				\n"
		"	.previous					\n"
		"	.set	mips0					\n"
		: [old] "=&r" (old),
		  [err] "=&r" (err),
		  [tmp] "=&r" (tmp)
		: [addr] "r" (addr),
		  [new] "r" (new),
		  [efault] "i" (-EFAULT)
		: "memory");
	} else {
		do {
			preempt_disable();
			ll_bit = 1;
			ll_task = current;
			preempt_enable();

			err = __get_user(old, (unsigned int *) addr);
			err |= __put_user(new, (unsigned int *) addr);
			if (err)
				break;
			rmb();
		} while (!ll_bit);
	}

	if (unlikely(err))
		return err;

	regs->regs[2] = old;
	regs->regs[7] = 0;	/* No error */

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
	"	move	$29, %0						\n"
	"	j	syscall_exit					\n"
	: /* no outputs */
	: "r" (regs));

	/* unreached.  Honestly.  */
	while (1);
}

save_static_function(sys_sysmips);
static int __used noinline
_sys_sysmips(nabi_no_regargs struct pt_regs regs)
{
	long cmd, arg1, arg2, arg3;

	cmd = regs.regs[4];
	arg1 = regs.regs[5];
	arg2 = regs.regs[6];
	arg3 = regs.regs[7];

	switch (cmd) {
	case MIPS_ATOMIC_SET:
		return mips_atomic_set(&regs, arg1, arg2);

	case MIPS_FIXADE:
		if (arg1 & ~3)
			return -EINVAL;

		if (arg1 & 1)
			set_thread_flag(TIF_FIXADE);
		else
			clear_thread_flag(TIF_FIXADE);
		if (arg1 & 2)
			set_thread_flag(TIF_LOGADE);
		else
			clear_thread_flag(TIF_FIXADE);

		return 0;

	case FLUSH_CACHE:
		__flush_cache_all();
		return 0;
	}

	return -EINVAL;
}

/*
 * No implemented yet ...
 */
SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
{
	return -ENOSYS;
}

/*
 * If we ever come here the user sp is bad.  Zap the process right away.
 * Due to the bad stack signaling wouldn't work.
 */
asmlinkage void bad_stack(void)
{
	do_exit(SIGSEGV);
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename,
		  const char *const argv[],
		  const char *const envp[])
{
	register unsigned long __a0 asm("$4") = (unsigned long) filename;
	register unsigned long __a1 asm("$5") = (unsigned long) argv;
	register unsigned long __a2 asm("$6") = (unsigned long) envp;
	register unsigned long __a3 asm("$7");
	unsigned long __v0;

	__asm__ volatile ("					\n"
	"	.set	noreorder				\n"
	"	li	$2, %5		# __NR_execve		\n"
	"	syscall						\n"
	"	move	%0, $2					\n"
	"	.set	reorder					\n"
	: "=&r" (__v0), "=r" (__a3)
	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
	: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
	  "memory");

	if (__a3 == 0)
		return __v0;

	return -__v0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Copyright (C) 2001 MIPS Technologies, Inc.
	9	*/
a9415644	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <linux/linkage.h>
	13	#include <linux/mm.h>
4e950f6f	14	#include <linux/fs.h>
1da177e4	15	#include <linux/smp.h>
1da177e4 LT	16	#include <linux/mman.h>
	17	#include <linux/ptrace.h>
	18	#include <linux/sched.h>
	19	#include <linux/string.h>
	20	#include <linux/syscalls.h>
	21	#include <linux/file.h>
1da177e4 LT	22	#include <linux/utsname.h>
	23	#include <linux/unistd.h>
	24	#include <linux/sem.h>
	25	#include <linux/msg.h>
	26	#include <linux/shm.h>
	27	#include <linux/compiler.h>
9ff77c46	28	#include <linux/module.h>
cba4fbbf	29	#include <linux/ipc.h>
f1e39a4a	30	#include <linux/uaccess.h>
5a0e3ad6	31	#include <linux/slab.h>
1091458d	32	#include <linux/random.h>
652b14aa	33	#include <linux/elf.h>
1da177e4	34
f1e39a4a	35	#include <asm/asm.h>
1da177e4 LT	36	#include <asm/branch.h>
	37	#include <asm/cachectl.h>
	38	#include <asm/cacheflush.h>
048eb582	39	#include <asm/asm-offsets.h>
1da177e4 LT	40	#include <asm/signal.h>
	41	#include <asm/sim.h>
	42	#include <asm/shmparam.h>
	43	#include <asm/sysmips.h>
	44	#include <asm/uaccess.h>
	45
8213bbf9 RB	46	/*
	47	* For historic reasons the pipe(2) syscall on MIPS has an unusual calling
	48	* convention. It returns results in registers $v0 / $v1 which means there
	49	* is no need for it to do verify the validity of a userspace pointer
	50	* argument. Historically that used to be expensive in Linux. These days
	51	* the performance advantage is negligible.
	52	*/
	53	asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
1da177e4 LT	54	{
	55	int fd[2];
	56	int error, res;
	57
ed8cae8b	58	error = do_pipe_flags(fd, 0);
1da177e4 LT	59	if (error) {
	60	res = error;
	61	goto out;
	62	}
	63	regs.regs[3] = fd[1];
	64	res = fd[0];
	65	out:
	66	return res;
	67	}
	68
	69	unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
	70
9ff77c46 RB	71	EXPORT_SYMBOL(shm_align_mask);
9ff77c46 RB	72
1da177e4 LT	73	#define COLOUR_ALIGN(addr,pgoff) \
	74	((((addr) + shm_align_mask) & ~shm_align_mask) + \
	75	(((pgoff) << PAGE_SHIFT) & shm_align_mask))
	76
	77	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	78	unsigned long len, unsigned long pgoff, unsigned long flags)
	79	{
	80	struct vm_area_struct * vmm;
	81	int do_color_align;
	82	unsigned long task_size;
	83
c52d0d30 DD	84	#ifdef CONFIG_32BIT
	85	task_size = TASK_SIZE;
	86	#else /* Must be CONFIG_64BIT*/
	87	task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
	88	#endif
1da177e4	89
098362e7 DD	90	if (len > task_size)
	91	return -ENOMEM;
	92
1da177e4	93	if (flags & MAP_FIXED) {
098362e7 DD	94	/* Even MAP_FIXED mappings must reside within task_size. */
	95	if (task_size - len < addr)
	96	return -EINVAL;
	97
1da177e4 LT	98	/*
	99	* We do not accept a shared mapping if it would violate
	100	* cache aliasing constraints.
	101	*/
e77414e0 AV	102	if ((flags & MAP_SHARED) &&
e77414e0 AV	103	((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
1da177e4 LT	104	return -EINVAL;
	105	return addr;
	106	}
	107
1da177e4 LT	108	do_color_align = 0;
	109	if (filp \|\| (flags & MAP_SHARED))
	110	do_color_align = 1;
	111	if (addr) {
	112	if (do_color_align)
	113	addr = COLOUR_ALIGN(addr, pgoff);
	114	else
	115	addr = PAGE_ALIGN(addr);
	116	vmm = find_vma(current->mm, addr);
	117	if (task_size - len >= addr &&
	118	(!vmm \|\| addr + len <= vmm->vm_start))
	119	return addr;
	120	}
1091458d	121	addr = current->mm->mmap_base;
1da177e4 LT	122	if (do_color_align)
	123	addr = COLOUR_ALIGN(addr, pgoff);
	124	else
	125	addr = PAGE_ALIGN(addr);
	126
	127	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
	128	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
	129	if (task_size - len < addr)
	130	return -ENOMEM;
	131	if (!vmm \|\| addr + len <= vmm->vm_start)
	132	return addr;
	133	addr = vmm->vm_end;
	134	if (do_color_align)
	135	addr = COLOUR_ALIGN(addr, pgoff);
	136	}
	137	}
	138
1091458d DD	139	void arch_pick_mmap_layout(struct mm_struct *mm)
	140	{
	141	unsigned long random_factor = 0UL;
	142
	143	if (current->flags & PF_RANDOMIZE) {
	144	random_factor = get_random_int();
	145	random_factor = random_factor << PAGE_SHIFT;
	146	if (TASK_IS_32BIT_ADDR)
	147	random_factor &= 0xfffffful;
	148	else
	149	random_factor &= 0xffffffful;
	150	}
	151
	152	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
	153	mm->get_unmapped_area = arch_get_unmapped_area;
	154	mm->unmap_area = arch_unmap_area;
	155	}
	156
652b14aa DD	157	static inline unsigned long brk_rnd(void)
	158	{
	159	unsigned long rnd = get_random_int();
	160
	161	rnd = rnd << PAGE_SHIFT;
	162	/* 8MB for 32bit, 256MB for 64bit */
	163	if (TASK_IS_32BIT_ADDR)
	164	rnd = rnd & 0x7ffffful;
	165	else
	166	rnd = rnd & 0xffffffful;
	167
	168	return rnd;
	169	}
	170
	171	unsigned long arch_randomize_brk(struct mm_struct *mm)
	172	{
	173	unsigned long base = mm->brk;
	174	unsigned long ret;
	175
	176	ret = PAGE_ALIGN(base + brk_rnd());
	177
	178	if (ret < mm->brk)
	179	return mm->brk;
	180
	181	return ret;
	182	}
	183
dbda6ac0 RB	184	SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
	185	unsigned long, prot, unsigned long, flags, unsigned long,
	186	fd, off_t, offset)
1da177e4 LT	187	{
	188	unsigned long result;
	189
	190	result = -EINVAL;
	191	if (offset & ~PAGE_MASK)
	192	goto out;
	193
f8b72560	194	result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
1da177e4 LT	195
	196	out:
	197	return result;
	198	}
	199
dbda6ac0 RB	200	SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
	201	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	202	unsigned long, pgoff)
1da177e4	203	{
947df17c PA	204	if (pgoff & (~PAGE_MASK >> 12))
	205	return -EINVAL;
	206
f8b72560	207	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
1da177e4 LT	208	}
	209
	210	save_static_function(sys_fork);
f5dbeaf5	211	static int __used noinline
1da177e4 LT	212	_sys_fork(nabi_no_regargs struct pt_regs regs)
	213	{
	214	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
	215	}
	216
	217	save_static_function(sys_clone);
f5dbeaf5	218	static int __used noinline
1da177e4 LT	219	_sys_clone(nabi_no_regargs struct pt_regs regs)
	220	{
	221	unsigned long clone_flags;
	222	unsigned long newsp;
3c37026d	223	int __user parent_tidptr, child_tidptr;
1da177e4 LT	224
	225	clone_flags = regs.regs[4];
	226	newsp = regs.regs[5];
	227	if (!newsp)
	228	newsp = regs.regs[29];
3c37026d RB	229	parent_tidptr = (int __user *) regs.regs[6];
	230	#ifdef CONFIG_32BIT
	231	/* We need to fetch the fifth argument off the stack. */
	232	child_tidptr = NULL;
	233	if (clone_flags & (CLONE_CHILD_SETTID \| CLONE_CHILD_CLEARTID)) {
	234	int __user __user usp = (int __user __user ) regs.regs[29];
	235	if (regs.regs[2] == __NR_syscall) {
	236	if (get_user (child_tidptr, &usp[5]))
	237	return -EFAULT;
	238	}
	239	else if (get_user (child_tidptr, &usp[4]))
	240	return -EFAULT;
	241	}
	242	#else
	243	child_tidptr = (int __user *) regs.regs[8];
	244	#endif
1da177e4 LT	245	return do_fork(clone_flags, newsp, &regs, 0,
	246	parent_tidptr, child_tidptr);
	247	}
	248
	249	/*
	250	* sys_execve() executes a new program.
	251	*/
	252	asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
	253	{
	254	int error;
	255	char * filename;
	256
c7887325	257	filename = getname((const char __user *) (long)regs.regs[4]);
1da177e4 LT	258	error = PTR_ERR(filename);
	259	if (IS_ERR(filename))
	260	goto out;
d7627467 DH	261	error = do_execve(filename,
	262	(const char __user const __user ) (long)regs.regs[5],
	263	(const char __user const __user ) (long)regs.regs[6],
	264	&regs);
1da177e4 LT	265	putname(filename);
	266
	267	out:
	268	return error;
	269	}
	270
dbda6ac0	271	SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
3c37026d	272	{
dc8f6029	273	struct thread_info *ti = task_thread_info(current);
3c37026d RB	274
3c37026d RB	275	ti->tp_value = addr;
a3692020 RB	276	if (cpu_has_userlocal)
a3692020 RB	277	write_c0_userlocal(addr);
06be375b RB	278
06be375b RB	279	return 0;
3c37026d RB	280	}
3c37026d RB	281
f1e39a4a RB	282	static inline int mips_atomic_set(struct pt_regs *regs,
f1e39a4a RB	283	unsigned long addr, unsigned long new)
1da177e4	284	{
f1e39a4a RB	285	unsigned long old, tmp;
	286	unsigned int err;
	287
	288	if (unlikely(addr & 3))
	289	return -EINVAL;
	290
	291	if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
	292	return -EINVAL;
	293
	294	if (cpu_has_llsc && R10000_LLSC_WAR) {
	295	__asm__ __volatile__ (
a91be9ee	296	" .set mips3 \n"
f1e39a4a RB	297	" li %[err], 0 \n"
	298	"1: ll %[old], (%[addr]) \n"
	299	" move %[tmp], %[new] \n"
	300	"2: sc %[tmp], (%[addr]) \n"
	301	" beqzl %[tmp], 1b \n"
	302	"3: \n"
	303	" .section .fixup,\"ax\" \n"
	304	"4: li %[err], %[efault] \n"
	305	" j 3b \n"
	306	" .previous \n"
	307	" .section __ex_table,\"a\" \n"
	308	" "STR(PTR)" 1b, 4b \n"
	309	" "STR(PTR)" 2b, 4b \n"
	310	" .previous \n"
a91be9ee	311	" .set mips0 \n"
f1e39a4a RB	312	: [old] "=&r" (old),
	313	[err] "=&r" (err),
	314	[tmp] "=&r" (tmp)
	315	: [addr] "r" (addr),
	316	[new] "r" (new),
	317	[efault] "i" (-EFAULT)
	318	: "memory");
	319	} else if (cpu_has_llsc) {
	320	__asm__ __volatile__ (
a91be9ee	321	" .set mips3 \n"
f1e39a4a RB	322	" li %[err], 0 \n"
	323	"1: ll %[old], (%[addr]) \n"
	324	" move %[tmp], %[new] \n"
	325	"2: sc %[tmp], (%[addr]) \n"
	326	" bnez %[tmp], 4f \n"
	327	"3: \n"
	328	" .subsection 2 \n"
	329	"4: b 1b \n"
	330	" .previous \n"
	331	" \n"
	332	" .section .fixup,\"ax\" \n"
	333	"5: li %[err], %[efault] \n"
	334	" j 3b \n"
	335	" .previous \n"
	336	" .section __ex_table,\"a\" \n"
	337	" "STR(PTR)" 1b, 5b \n"
	338	" "STR(PTR)" 2b, 5b \n"
	339	" .previous \n"
a91be9ee	340	" .set mips0 \n"
f1e39a4a RB	341	: [old] "=&r" (old),
	342	[err] "=&r" (err),
	343	[tmp] "=&r" (tmp)
	344	: [addr] "r" (addr),
	345	[new] "r" (new),
	346	[efault] "i" (-EFAULT)
	347	: "memory");
	348	} else {
	349	do {
	350	preempt_disable();
	351	ll_bit = 1;
	352	ll_task = current;
	353	preempt_enable();
	354
	355	err = __get_user(old, (unsigned int *) addr);
	356	err \|= __put_user(new, (unsigned int *) addr);
	357	if (err)
	358	break;
	359	rmb();
	360	} while (!ll_bit);
	361	}
	362
	363	if (unlikely(err))
	364	return err;
	365
	366	regs->regs[2] = old;
	367	regs->regs[7] = 0; /* No error */
	368
	369	/*
	370	* Don't let your children do this ...
	371	*/
	372	__asm__ __volatile__(
	373	" move $29, %0 \n"
	374	" j syscall_exit \n"
	375	: /* no outputs */
	376	: "r" (regs));
	377
	378	/* unreached. Honestly. */
	379	while (1);
	380	}
	381
	382	save_static_function(sys_sysmips);
	383	static int __used noinline
	384	_sys_sysmips(nabi_no_regargs struct pt_regs regs)
	385	{
	386	long cmd, arg1, arg2, arg3;
	387
	388	cmd = regs.regs[4];
	389	arg1 = regs.regs[5];
	390	arg2 = regs.regs[6];
	391	arg3 = regs.regs[7];
	392
293c5bd1	393	switch (cmd) {
1da177e4	394	case MIPS_ATOMIC_SET:
f1e39a4a	395	return mips_atomic_set(&regs, arg1, arg2);
1da177e4 LT	396
1da177e4 LT	397	case MIPS_FIXADE:
293c5bd1 RB	398	if (arg1 & ~3)
	399	return -EINVAL;
	400
	401	if (arg1 & 1)
	402	set_thread_flag(TIF_FIXADE);
	403	else
	404	clear_thread_flag(TIF_FIXADE);
	405	if (arg1 & 2)
	406	set_thread_flag(TIF_LOGADE);
	407	else
	408	clear_thread_flag(TIF_FIXADE);
	409
1da177e4 LT	410	return 0;
	411
	412	case FLUSH_CACHE:
	413	__flush_cache_all();
	414	return 0;
1da177e4 LT	415	}
	416
	417	return -EINVAL;
	418	}
	419
1da177e4 LT	420	/*
	421	* No implemented yet ...
	422	*/
dbda6ac0	423	SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
1da177e4 LT	424	{
	425	return -ENOSYS;
	426	}
	427
	428	/*
	429	* If we ever come here the user sp is bad. Zap the process right away.
	430	* Due to the bad stack signaling wouldn't work.
	431	*/
	432	asmlinkage void bad_stack(void)
	433	{
	434	do_exit(SIGSEGV);
	435	}
fe74290d AB	436
	437	/*
	438	* Do a system call from kernel instead of calling sys_execve so we
	439	* end up with proper pt_regs.
	440	*/
d7627467 DH	441	int kernel_execve(const char *filename,
	442	const char *const argv[],
	443	const char *const envp[])
fe74290d AB	444	{
	445	register unsigned long __a0 asm("$4") = (unsigned long) filename;
	446	register unsigned long __a1 asm("$5") = (unsigned long) argv;
	447	register unsigned long __a2 asm("$6") = (unsigned long) envp;
	448	register unsigned long __a3 asm("$7");
	449	unsigned long __v0;
	450
	451	__asm__ volatile (" \n"
	452	" .set noreorder \n"
	453	" li $2, %5 # __NR_execve \n"
	454	" syscall \n"
	455	" move %0, $2 \n"
	456	" .set reorder \n"
	457	: "=&r" (__v0), "=r" (__a3)
	458	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
	459	: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
	460	"memory");
	461
	462	if (__a3 == 0)
	463	return __v0;
	464
	465	return -__v0;
	466	}